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Inventory (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of inventories [Abstract]  
Schedule of Inventory

December 31, 2017
December 31, 2016
In-process precious metals
$131.6

$120.7

Ore in stockpiles
44.1

37.6

Parts and supplies
41.5

35.7

Dore, refined precious metals and gold in concentrate
12.7

13.5

 
229.9

207.5

Less: Long-term inventory
(68.7
)
(75.8
)
 
$161.2

$131.7